21231201032 has 8 divisors (see below), whose sum is σ = 39808501950. Its totient is φ = 10615600512.

The previous prime is 21231201029. The next prime is 21231201037. The reversal of 21231201032 is 23010213212.

It can be written as a sum of positive squares in only one way, i.e., 15093105316 + 6138095716 = 122854^2 + 78346^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21231201032² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21231201032.

It is not an unprimeable number, because it can be changed into a prime (21231201037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1326950057 + ... + 1326950072.

Almost surely, 2^21231201032 is an apocalyptic number.

It is an amenable number.

21231201032 is a deficient number, since it is larger than the sum of its proper divisors (18577300918).

21231201032 is a wasteful number, since it uses less digits than its factorization.

21231201032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2653900135 (or 2653900131 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21231201032 its reverse (23010213212), we get a palindrome (44241414244).

The spelling of 21231201032 in words is "twenty-one billion, two hundred thirty-one million, two hundred one thousand, thirty-two".